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Research Interests

Abrupt climate change

Paleoclimate model-data comparisons

Paleolimnology and paleohydrology

Current Research

The goal of my research is to understand the causes and impacts of past climate change, and to use this information to anticipate future changes and their consequences. To accomplish this, I use lake sediments to document how climate varied in the past and coupled climate models to explore why these variations occurred. My current projects are focused on major changes during the Holocene (our present interglacial period) that happened relatively abruptly, over periods of decades to a century. These projects include: modeling the global impacts of freshwater anomalies in the North Atlantic and mapping the spatial extent of climate changes during the middle Holocene that possibly coincided with the collapse of several ancient civilizations.